China for the first time deployed a robot to maintain security at Shenzhen International Airport The robot's has a digital display and a high-definition camera to take pictures of travellers for analysis. It can answer passengers' questions about flight information and communicate with people. It can move at speeds of up to 18 kph and can also look for explosives, weapons and drugs. They are also equipped with a defence mechanism: an extendable arm that produces an electrical current.